Dynamics Of Hadronization From Nuclear Semi Inclusive Deep Inelastic Scattering

The CLAS experiment E02-104, part of the EG2 run at Jefferson Lab, was performed to study the hadronization process using semi inclusive deep inelastic scattering off nuclei. Electron beam energy of 5 GeV and the CLAS large acceptance detector were used to study charged pion production. The high luminosity available at Jefferson Lab and the CLAS large acceptance are key factors for such measurements allowing high statistics and therefore multidimensional analyses of the data. Both the multiplicity ratio and the transverse momentum broadening for carbon, iron and lead relative to deuterium are measured. Preliminary results for positive pions are discussed.Comment: 4 pages, 2 figures, CIPANP 2006 in Puerto Ric

Ovisnost kutnih raspodjela o helicitetu u fototvorbi parova nabijenih piona

Two-pion photoproduction in the reaction γp → pπ +π − has been studied at Jefferson Lab Hall B using a circularly polarized tagged-photon beam in the energy range between 0.6 GeV and 2.3 GeV. Owing to the large angular acceptance of the CLAS detector, complete beam-helicity-dependent angular distributions of the final-state particles were measured. The large cross-section asymmetries exhibit strong sensitivity to the kinematics of the reaction and provide valuable information on the reaction dynamics. Preliminary results are presented.Istraživali smo dvopionsku fototvorbu u reakciji γp → pπ +π − pomoću cirkularno polariziranog snopa obilježenih fotona na energijama između 0.6 GeV i 2.3 GeV u Hali B Jeffersonovog Laba. Zahvaljujući velikom prihvatnom kutu detektora CLAS, izmjerili smo potpune kutne raspodjele čestica u konačnom stanju u ovisnosti o helicitetu snopa. Velike asimetrije udarnih presjeka pokazuju jaku ovisnost o kinematici reakcije i pružaju važne podatke o njenoj dinamici. Predstavljaju se prethodni ishodi mjerenja

Mjerenja u JLab s realnim fotonima pomoću fotonskog označivača u dvorani B

Data on real-photon induced reactions have been taken using the Tagged Photon Facility (TPF) and the Continuous Electron Beam Accelerator Facility (CEBAF) at the Thomas Jefferson National Accelerator Facility (JLab) during the first year of running in Hall B. These data have been taken for the purpose of investigating the electromagnetic structure of mesons, nucleons, and nuclei. This report summarizes the status of these experiments.Tijekom prve godine rada sustava s označavanjem fotona u dvorani B pri ubrzivaču s neprekidnim elektronskim snopom (CEBAF) u Thomas Jeffersonovom nationalnom akceleratorskom pogonu (JLab) postigli su se podaci o raznim fotonima izazvanim reakcijama. Tim se podacima istražuju elektromagnetske strukture mezona, nukleona i atomskih jezgri. Ovaj je rad sažetak tih mjerenja

The proton structure function F2 in the resonance region

Unique measurement of the proton structure function F2 in a wide two-dimensional region of x and Q**2 has been reported. The accessible kinematics covers entire resonance region up to W=2.5 GeV in the Q**2 interval from 0.1 to 4.5 GeV**2. Obtained data allowed for the first time an evaluation of moments of the structure function F2 directly from experimental data as well as an intensive study of the Bloom-Gilman duality phenomenon.Comment: 6 pages, 4 figures, Proceedings of GDH2002 Conference, 3-6 July 2002, Genova, Italy, to be published in World Scientifi